Buggy code:
public abstract class AbstractFileSet extends DataType implements Cloneable , SelectorContainer { private PatternSet defaultPatterns = new PatternSet ( ) ; private Vector additionalPatterns = new Vector ( ) ; private Vector selectors = new Vector ( ) ; private File dir ; private boolean useDefaultExcludes = true ; private boolean caseSensitive = true ; private boolean followSymlinks = true ; private boolean errorOnMissingDir = true ; private DirectoryScanner directoryScanner = null ; public AbstractFileSet ( ) { } protected AbstractFileSet ( AbstractFileSet fileset ) { } public void setRefid ( Reference r ) throws BuildException { } public synchronized void setDir ( File dir ) throws BuildException { } public File getDir ( ) { } public synchronized File getDir ( Project p ) { } public synchronized PatternSet createPatternSet ( ) { } public synchronized NameEntry createInclude ( ) { } public synchronized NameEntry createIncludesFile ( ) { } public synchronized NameEntry createExclude ( ) { } public synchronized NameEntry createExcludesFile ( ) { } public synchronized void setFile ( File file ) { } public synchronized void setIncludes ( String includes ) { } public synchronized void appendIncludes ( String [ ] includes ) { } public synchronized void setExcludes ( String excludes ) { } public synchronized void appendExcludes ( String [ ] excludes ) { } public synchronized void setIncludesfile ( File incl ) throws BuildException { } public synchronized void setExcludesfile ( File excl ) throws BuildException { } public synchronized void setDefaultexcludes ( boolean useDefaultExcludes ) { } public synchronized boolean getDefaultexcludes ( ) { } public synchronized void setCaseSensitive ( boolean caseSensitive ) { } public synchronized boolean isCaseSensitive ( ) { } public synchronized void setFollowSymlinks ( boolean followSymlinks ) { } public synchronized boolean isFollowSymlinks ( ) { } public void setErrorOnMissingDir ( boolean errorOnMissingDir ) { } public DirectoryScanner getDirectoryScanner ( ) { } public DirectoryScanner getDirectoryScanner ( Project p ) { if ( isReference ( ) ) { return getRef ( p ) . getDirectoryScanner ( p ) ; } DirectoryScanner ds = null ; synchronized ( this ) { if ( ( ( directoryScanner ) != null ) && ( p == ( getProject ( ) ) ) ) { ds = directoryScanner ; } else { if ( ( dir ) == null ) { throw new BuildException ( ( ( "No<seq2seq4repair_space>directory<seq2seq4repair_space>specified<seq2seq4repair_space>for<seq2seq4repair_space>" + ( getDataTypeName ( ) ) ) + "." ) ) ; } if ( ( ! ( dir . exists ( ) ) ) && ( errorOnMissingDir ) ) { <START_BUG> throw new BuildException ( ( ( dir . getAbsolutePath ( ) ) + "<seq2seq4repair_space>not<seq2seq4repair_space>found." ) ) ; <END_BUG> } if ( ( ! ( dir . isDirectory ( ) ) ) && ( dir . exists ( ) ) ) { throw new BuildException ( ( ( dir . getAbsolutePath ( ) ) + "<seq2seq4repair_space>is<seq2seq4repair_space>not<seq2seq4repair_space>a<seq2seq4repair_space>directory." ) ) ; } ds = new DirectoryScanner ( ) ; setupDirectoryScanner ( ds , p ) ; ds . setFollowSymlinks ( followSymlinks ) ; ds . setErrorOnMissingDir ( errorOnMissingDir ) ; directoryScanner = ( p == ( getProject ( ) ) ) ? ds : directoryScanner ; } } ds . scan ( ) ; return ds ; } public void setupDirectoryScanner ( FileScanner ds ) { } public synchronized void setupDirectoryScanner ( FileScanner ds , Project p ) { } protected AbstractFileSet getRef ( Project p ) { } public synchronized boolean hasSelectors ( ) { } public synchronized boolean hasPatterns ( ) { } public synchronized int selectorCount ( ) { } public synchronized FileSelector [ ] getSelectors ( Project p ) { } public synchronized Enumeration selectorElements ( ) { } public synchronized void appendSelector ( FileSelector selector ) { } public void addSelector ( SelectSelector selector ) { } public void addAnd ( AndSelector selector ) { } public void addOr ( OrSelector selector ) { } public void addNot ( NotSelector selector ) { } public void addNone ( NoneSelector selector ) { } public void addMajority ( MajoritySelector selector ) { } public void addDate ( DateSelector selector ) { } public void addSize ( SizeSelector selector ) { } public void addDifferent ( DifferentSelector selector ) { } public void addFilename ( FilenameSelector selector ) { } public void addType ( TypeSelector selector ) { } public void addCustom ( ExtendSelector selector ) { } public void addContains ( ContainsSelector selector ) { } public void addPresent ( PresentSelector selector ) { } public void addDepth ( DepthSelector selector ) { } public void addDepend ( DependSelector selector ) { } public void addContainsRegexp ( ContainsRegexpSelector selector ) { } public void addModified ( ModifiedSelector selector ) { } public void addReadable ( ReadableSelector r ) { } public void addWritable ( WritableSelector w ) { } public void add ( FileSelector selector ) { } public String toString ( ) { } public synchronized Object clone ( ) { } public String [ ] mergeIncludes ( Project p ) { } public String [ ] mergeExcludes ( Project p ) { } public synchronized PatternSet mergePatterns ( Project p ) { } }

Fix:
throw new BuildException ( ( ( dir . getAbsolutePath ( ) ) + "<seq2seq4repair_space>does<seq2seq4repair_space>not<seq2seq4repair_space>exist." ) ) ;